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From: "J.R." <groups_jr-1@yahoo.com.br>
Newsgroups: comp.lang.javascript
Subject: Re: Difference between findPos("divThis") and findPos(divThis)
Date: Sun, 13 Nov 2011 18:55:32 -0200
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On 13/11/2011 18:04,  Cal Who wrote:
>   >
>> But I will still ignore you if you (continue to) post with an invalid
>> From/Reply-To header field value.  Usenet can only work if communication
>> works both ways.
>
> I have no idea what it is about. I use IE Express and reply with "Reply
> Group"
> Do I have something set up wrong?
> '
>>
>>> Is the first approch (var w = document.getElementById(obj).offsetWidth)
>>> the better one?
>>
>> Yes and no.  It is the better one if you pass the element's ID string for
>> `obj'.  It is not better if you call document.getElementById(obj) twice in
>> the process.  There are also cases where you do not need to call
>> document.getElementById(); in that case it would be better not to call it.
>>
>
> That's what I'll do then.
>
> Thanks
>
>

I always use obj as a reference to an element of the DOM. But I admit 
there are cases in which you would like to receive either a string or an 
element reference as the function's argument. In this case, try this code:

function getOuterDimensions(obj) {
   var el = (typeof obj == 'string') ? document.getElementById(obj) :
            obj,
   w = el.offsetWidth;
   h = el.offsetHeight;
   ...

}

Please, have a look at the post called "David Mark's Javascript Tip Du 
Jour - Volume #1 - Tip #1234 - How to Measure Element Dimensions".

-- 
Joao Rodrigues (J.R.)